Rotary hook for sewing machines



W. MYERS ROTARY HOOK FOR SEWING MACHINES Aug. 14, 1934.

Origiaal Filed Aug. 4, 1932 Wiiweay EM N. am

Patented Aug. 14, 1934 I I I 1,970,428 ROTARY HOOK FOR sswnvo MACHINES Walter Myers, Bridgeport, Conn, assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Original application August 4, 1932, Serial-No. 627,409. Dlvided and this application May 13, 1933, Serial No. 670,91051 7 Claims. (oi. 112-228) This invention relates to sewing machines and hook-body 6 by means of the flat gib which has for an object to provide an improved rotary is screwed to the top of the rim of the hook-body hook and bobbin-case mechanism which-is cool and is formed adjacent the base of the loopand clean running under high speed operating taking hook 7 with a loop-casting hook 21, the

5 conditions. point of which terminates in rear ;o the point 63 With the above and other objects in view, as of the loop-seizing hook so as to catch one limb will hereinafter appear, the invention comprises of the needle-loop after it is seized by the loopthe devices, combinations, and arrangements of seizing hook and assist in spreading such ioop' parts hereinafter set forth and illustrated in the over the bobbin-case.

l0 accompanying drawing of a preferred embodi- For lubrication of the bobbin-case raceway, the ment of the invention, from which the several bearing rib 14 thereof is made relatively wide features of the invention and the advantages atvertically and is provided with segmental, closed tained thereby will be readily understood by those bottomed, pockets or wells 22 which are filled with skilled in the art. v felt or similar lubricant-holding wicking. These 1B In the accompanying drawing, Fig. 1. is a top pockets 22 are formed entirely in the bobbin-case, plan view of the work-supporting arm of'a feedbearing rib 14 and lie wholly below the plane of off-arm sewing machine embodying the inventhe under bearing-face of the gib 20 and below tion. Fig. 2 is a transverse section through the the upper end of the bobbin-case where they work-supporting arm. Fig. 3 is a disassembled cannot be engaged by the sewing thread to soil 20 perspective view of one of the rotary hook and the latter. These pockets 22 have a segmental 2'5 bobbin-case devices shown in Figs. 1 and 2. Fig. length and vertical depth suflicient to provide a 4 is a plan view of the bobbin-case shown in Fig. relatively large oil-holding capacity and will em- 3. Fig. 5 is an edge view or elevation of the ciently lubricate the respective hook-races for a bobbin-case shown in Figs. 3 and 4, and Fig. 6 considerable time without replenishment of lubri- 25- is a fragmentary sectional view through the bobcant. Laterally extending constricted oil-ducts bin-case bea ing rib a d ho k-raceway. 23 at different levels, FigI 5, above the bottoms This application is a division of application of the pockets 22'feed oil gradually but in sufli- Serial No. 627,409; filed Aug. 4, 1932. cient quantity from the pockets to the raceway 1 represents the work-supporting arm of a bearings. By having the constricted ducts 23 30 feed-off-arm sewing machine in which are at different levels the oilis applied simultaneously mounted on pivot screws 2 the laterally adjustto, different zones of the vertical bearing walls able bearing blocks 3 fitt d w th ba l-bea ngs and more evenly spread thereover without excess. 4 for the i al -shafts 5. a a ying a Having thus set forth the nature of the invencup-shaped rotary hook-body 6 having a portion Li h t I claim herein 35 of its wall cut away to form a loop-seizing beak 1,A rotary hook comprising a cup-shaped 7 and a e d eu d hook-body formed within its rim with a cylindri- E h y 6 s formed Within its Tim cal bobbin-case bearing wall and with an inwardly with a bobb nas e co p a ve c y extending bobbin-case bearing ledge at the base cylindrical bobbin-Case bearing Wall 9 below of said wall, the bearing surface of said ledge 40 which is an inwardly extending bearing ledge 10 being grooved adjacent said cylindrical bearing o v d at 1 a jac t t e Vertical b ar ng Wall wall to providev an inwardly disposed bearing sur- 9 to provide a raised annular horizontal bearing fa e raised above the bottomof said grooved por- Su ace 1 Sp d inwardly from the Vertical tion and spaced inwardly from said cylindrical bearing wall 9. wall, and a bobbin-case having a bearing rib 45 Thebobbm-case 13 has a bearing rlb l4 jourengaging said bearing wall and leuge naled 1n the hook-race and 15 formed Wlth 3. 10- 2 A ertical axis rotary hook comprising a cuptation-restraining notch .15 loosely embracing a shaped hook body formed within its rim with rotation'l'estmming lug on the under bobbin-case bearing race and cut away in one side side Of the thIOflt-Pliit 17. The bobbin-csse iS 'wall to form a, loop seizing hook a, stationary 50 also formed in its loop-cast-on side with a shoulbobbimcase jgurnaled in d raceway, and a der 18 nga d y t v at ry-fi r 19 f a movable flat circular gib secured to the rim of bobbin-case opener device to open a passage for said hook-body and formed in that portion adjathe upper limb of the needle-loop, as disclosed cent the base of the loop-seizing hook with a loopin said application Serial 'No. 627,409. The bobcasting hook the point of which terminates in rear 65 bin-case .13 is retained in the raceway in the of the point of the loop-seizing hook.

' outer bearing surface of said rib.

way, a bobbin-case having a peripheral bearing rib journaled in said raceway, said bearing rib being formed with a closed bottomed oil well and with a relatively constricted lateral oil-duct leading outwardly from one side of said oil-well to the 4. A sewing machine loop-taker having a raceway, a bobbin-case having a peripheral bearing rib journaled in said raceway, said bearing rib being formed with a closed bottomed oil well and with a relatively constricted lateral oil-duct leading outwardly from one side of said oil-well above the bottom of the latter to the outer bearing surface of said. rib. I

5. A vertical axis rotary hook having a cupshaped hook-body formed within its rim with a bobbin-case bearing race, a bobbin-case having a bearing rib journaled in said race, said bearing rib having below its upper surface, and within its outer periphery a closed bottomed segmental wick-filled oil-pocket, and a lateral oil-feed duct 3. A sewing machine loop-taker having a race-v leading from said pocket to the outer peripheral bearing surface of said rib.

6. A rotary hook having a cup-shaped hookbody formed within its rim with a bobbin-case bearing race, a gib removably secured to said hook-body and closing the top side of said race, a bobbin-case formed with a peripheral bearing rib Journaled in said race, said bobbin-case having below said gib a wick-filled oil-pocket and a constricted lateral oil-duct leading from said oilpocket to the outer surface of said bearing rib.

7. A sewing machine loop-taker having a raceway, a bobbin-case having a peripheral bearing rib journaled in said raceway, said bearing rib being formed with a plurality of closed bottomed oil-wells and with a plurality of relatively constricted lateral oil-ducts at different levels leading outwardly from said oil-wells above the respective bottoms of the latter to the outer bearing surface of said rib.

WALTER MYERS. 

